How many panels a Philippine home needs

Summary answer

Panel count starts with monthly electricity use and the portion you want solar to offset. The final count also depends on local production, daytime use, shading, panel wattage, inverter limits, and usable roof area.

What changes the answer

• Use twelve months of bills when possible because consumption changes by season.
• Choose a realistic target offset instead of assuming the entire bill can be removed.
• Higher-wattage panels reduce count but do not remove roof-layout and inverter constraints.
• Shading and roof orientation can make two roofs with the same area perform differently.

Practical checklist

1. Calculate monthly kWh rather than relying only on peso bill amount.
2. Estimate daytime consumption for a grid-tied system without a large battery.
3. Measure usable roof dimensions after setbacks and obstructions.
4. Request a site-specific production simulation before signing.

Evidence and limitations

The system-size and roof calculators use planning yields and geometry. An installer must verify solar resource, structural capacity, electrical design, and utility requirements.